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(1) Analytical procedure.
(a) The analytical procedure should include:
(i) A control test
(ii) A blank test
(iii) Duplicate analyses that should agree to
within 0.01% blood alcohol deviation from the mean.
(b) All sample remaining after analysis should
be retained for at least three months under suitable
storage conditions for further analysis if required.
(c) Each analyst shall engage in a program in
which some blood samples containing alcohol are
exchanged with other laboratories and tested on a
blind basis so that precision and accuracy can be
evaluated no less than one time per year.
(2) Reporting procedure.
(a) The results should be expressed as grams of
alcohol per 100 ml of whole blood sample.
(b) The analysis results should be reported to
two significant figures, using the mathematical rule
of rounding.
(c) Blood alcohol results on living subjects
0.0009% or lower shall be reported as negative.
Blood alcohol results on post-mortem samples of
0.019% or less shall be reported as negative. (See
WAC 448-14-010
(2)(b))
(3) Sample container and preservative.
(a) A chemically clean dry container consistent
with the size of the sample with an inert leak-proof
stopper shall be used.
(b) Blood samples for alcohol analysis shall be
preserved with an anticoagulant and an enzyme poison
sufficient in amount to prevent clotting and
stabilize the alcohol concentration. Suitable
preservatives and anticoagulants include the
combination of sodium fluoride and potassium
oxalate. |
